String isn't a type.dart(not_a_type)

Question

I'm relatively new to Dart and Flutter and I'm running in a basic error I'm not able to fix at the moment.

I get the following error in VS Code:

String isn't a type.dart(not_a_type)

That's my code snippet:

    [String] getIntArrayFor({PurposeEnum purpose, String categoryName}){
      switch(purpose){
        case PurposeEnum.somePurpose:
          return [];
        default:
          return [];
      }
    }

The error is marked at both String keywords in the function header.

Does anybody have an idea how to fix that?

Answer 1

if you want your method to return an array replace [String] with List<String>:

  List<String> getIntArrayFor({PurposeEnum purpose, String categoryName}){
  switch(purpose){
    case PurposeEnum.somePurpose:
      return <String>[] ;
    default:
      return <String>[] ;
  }
}

You can find more information about dart lists (which are the equivalent of arrays in other languages) in this official flutter docs link.